The roses are a nice idea, but you'll need to level the grade to keep the roses all at the same level. Trimming the roses bushes to get the same effect with look harsh and you'll lose the rounded fullness of the bushes

It will work fine. And you don't need to raise the level or have all the plants grow to an even height. A slope is a slope and things that grow to a certain height at the top of the slope will always be at a higher level than the same plants at the bottom and that is neither good nor bad.

you will need to fallow the slope when planting and have the plants going the same way as the slope to create a very interesting design. Begin tall and gradually go shorter ,follow the steps .

My neighbors told me today that this plan won’t work very well because of my sloped hill. They said it’s challenging and it wouldn’t look right planting the roses. Can someone crate a drawing of what they think would look good, and if possible the names of the plants/flowers? Thanks. I’ve been looking at a ton of photos online, but can’t find anything.

LOL!! Ignore the neighbors!! They really don't know what they are talking about. Your slope is not steep or large enough for it to be a challenge planting or establishing anything. The roses will be fine, if that's what you would like to use.

I develop designs for all manner of sloping yards or planting areas where leveling is not practical or desired and the look is quite attractive. The best look is achieved by a mass planting of a low, mounding type of plant which the Iceberg or any other shrubby, groundcover type rose will accomplish handily. You see this all the time with a similar area covered with a more traditional groundcover type plant - the roses will just be a somewhat taller growing groundcover!! You can use a border plant along the front edge if you like (not really necessary) but keep it a low growing one like dwarf English box or teucrium. Nothing that will get much beyond the height of the front wall.

Sorry, I do not have the ability to create a sketch for you online. But what you proposed initially will work!